1 UV_SHIFT Shift the phase center of UV table
        UV_SHIFT

    This task changes the phase tracking center of a UV table, by applying a
    phase shift on the data. The coordinate system can also be rotated using
    the  variable ANGLE$. Rotation is easier to apply in UV tables since ro‐
    tation and Fourier transform commute: only the U and V coordinates  have
    to be rotated.

2 UVTABLE$
        TASK\FILE "UV table to shift" UVTABLE$

    This  the  name of UV table to be shifted and/or rotated (input and out‐
    put)

2 RELATIVE$
        TASK\LOGICAL "Offset  (YES) or Absolute (NO) position" RELATIVE$

    This is a logical indicating whether the new position is relative to the
    current one (YES, offsets in radians specified) or given in absolute co‐
    ordinates (NO, R.A. and Dec. specified). Absolute  mode  is  recommended
    for sake of clarity.

2 OFFSET$
        TASK\REAL "Phase center offset (in radians)" OFFSET$[2]

    If the RELATIVE mode is selected, specify the offset (in radians) of the
    new phase tracking  center from the last phase tracking center.

2 RA_CENTER$
        TASK\CHARACTER "R.A. center" RA_CENTER$

    In absolute mode, specify the Right Ascension  in  sexagesimal  notation
    (HH:MM:SS.sss)

2 DEC_CENTER$
        TASK\CHARACTER "Declination center" DEC_CENTER$

    In absolute mode, specify the Declination of the new phase tracking cen‐
    ter in sexagesimal notation (+dd:mm:ss.ss)

2 ANGLE$
        TASK\REAL "Angle" ANGLE$

    The angle (East from North) by which the table must be rotated.  This is
    the  absolute position angle of direction which will become the apparent
    North in the rotated coordinates.

1 ENDOFHELP

















